[rbak-nsp] link group on 4x10G card (SE600/1200) for dot1q purpose

[Wojciech Wrona]

> Yes, correct!
> The link-group type gives some differences in traffic distribution. We observe a better distribution in dot1q type link-groups.

It is described in manual. dot1q link-groups are using normal hashing 
algorithms to load balance the traffic, and is is based on L4 elements 
(if configured) so it uses even IP protocol types and TCP/UDP ports to 
balance the traffic between ports/cards. But access link-groups works on 
the other way. Access link-group does NOT load balance the traffic, it 
only tries to distribute dynamic circuits evenly between links, but when 
for example new PPPoE session begins on port 1/1 it will use this port 
till the end of the session.

We're using it like that in our network and traffic load looks pretty 
much the same on both ports (~200-300M difference on 10G ports is not as 
much a problem).

I think it is quite ok for now, but the problem can be visible when we 
will be having customers for abour 1G or more.

Best regards,
-- 
Wojciech Wrona